diff --git a/YKanBan/Views/Dialogs/DialogWindow.cs b/YKanBan/Views/Dialogs/DialogWindow.cs
index ef19c18..e4dc799 100644
--- a/YKanBan/Views/Dialogs/DialogWindow.cs
+++ b/YKanBan/Views/Dialogs/DialogWindow.cs
@@ -1,3 +1,4 @@
+using System.Diagnostics;
 using Avalonia.Controls;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
@@ -85,6 +86,12 @@ public class DialogWindow : Window
         {
             await _viewModel.RequestCancelAsync();
         }
+        catch (Exception exception)
+        {
+            // An async void handler must not let a failure escape and end the
+            // process; the dialog simply stays open.
+            Debug.WriteLine(exception);
+        }
         finally
         {
             _cancelPending = false;